// Copyright 2025 DeepMind Technologies Limited.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.androidenv.accessibilityforwarder

import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.atomic.AtomicInteger
import java.util.function.Function

/** Thread-safe helper class for assigning a unique ID to an object. */
internal class UniqueIdsGenerator<A : Any> {
  private val nextId = AtomicInteger(0)
  private val uniqueIdsByNode = ConcurrentHashMap<A, Int>()

  fun getUniqueId(a: A): Int {
    return uniqueIdsByNode.computeIfAbsent(a, Function { _: A -> nextId.getAndIncrement() })
  }
}
